/**
 * Env.js
 *
 * Released under LGPL License.
 * Copyright (c) 1999-2017 Ephox Corp. All rights reserved
 *
 * License: http://www.tinymce.com/license
 * Contributing: http://www.tinymce.com/contributing
 */

/**
 * This class contains various environment constants like browser versions etc.
 * Normally you don't want to sniff specific browser versions but sometimes you have
 * to when it's impossible to feature detect. So use this with care.
 *
 * @class tinymce.Env
 * @static
 */
define(
  'tinymce.core.Env',
  [
  ],
  function () {
    var nav = navigator, userAgent = nav.userAgent;
    var opera, webkit, ie, ie11, ie12, gecko, mac, iDevice, android, fileApi, phone, tablet, windowsPhone;

    function matchMediaQuery(query) {
      return "matchMedia" in window ? matchMedia(query).matches : false;
    }

    opera = window.opera && window.opera.buildNumber;
    android = /Android/.test(userAgent);
    webkit = /WebKit/.test(userAgent);
    ie = !webkit && !opera && (/MSIE/gi).test(userAgent) && (/Explorer/gi).test(nav.appName);
    ie = ie && /MSIE (\w+)\./.exec(userAgent)[1];
    ie11 = userAgent.indexOf('Trident/') != -1 && (userAgent.indexOf('rv:') != -1 || nav.appName.indexOf('Netscape') != -1) ? 11 : false;
    ie12 = (userAgent.indexOf('Edge/') != -1 && !ie && !ie11) ? 12 : false;
    ie = ie || ie11 || ie12;
    gecko = !webkit && !ie11 && /Gecko/.test(userAgent);
    mac = userAgent.indexOf('Mac') != -1;
    iDevice = /(iPad|iPhone)/.test(userAgent);
    fileApi = "FormData" in window && "FileReader" in window && "URL" in window && !!URL.createObjectURL;
    phone = matchMediaQuery("only screen and (max-device-width: 480px)") && (android || iDevice);
    tablet = matchMediaQuery("only screen and (min-width: 800px)") && (android || iDevice);
    windowsPhone = userAgent.indexOf('Windows Phone') != -1;

    if (ie12) {
      webkit = false;
    }

    // Is a iPad/iPhone and not on iOS5 sniff the WebKit version since older iOS WebKit versions
    // says it has contentEditable support but there is no visible caret.
    var contentEditable = !iDevice || fileApi || userAgent.match(/AppleWebKit\/(\d*)/)[1] >= 534;

    return {
      /**
       * Constant that is true if the browser is Opera.
       *
       * @property opera
       * @type Boolean
       * @final
       */
      opera: opera,

      /**
       * Constant that is true if the browser is WebKit (Safari/Chrome).
       *
       * @property webKit
       * @type Boolean
       * @final
       */
      webkit: webkit,

      /**
       * Constant that is more than zero if the browser is IE.
       *
       * @property ie
       * @type Boolean
       * @final
       */
      ie: ie,

      /**
       * Constant that is true if the browser is Gecko.
       *
       * @property gecko
       * @type Boolean
       * @final
       */
      gecko: gecko,

      /**
       * Constant that is true if the os is Mac OS.
       *
       * @property mac
       * @type Boolean
       * @final
       */
      mac: mac,

      /**
       * Constant that is true if the os is iOS.
       *
       * @property iOS
       * @type Boolean
       * @final
       */
      iOS: iDevice,

      /**
       * Constant that is true if the os is android.
       *
       * @property android
       * @type Boolean
       * @final
       */
      android: android,

      /**
       * Constant that is true if the browser supports editing.
       *
       * @property contentEditable
       * @type Boolean
       * @final
       */
      contentEditable: contentEditable,

      /**
       * Transparent image data url.
       *
       * @property transparentSrc
       * @type Boolean
       * @final
       */
      transparentSrc: "",

      /**
       * Returns true/false if the browser can or can't place the caret after a inline block like an image.
       *
       * @property noCaretAfter
       * @type Boolean
       * @final
       */
      caretAfter: ie != 8,

      /**
       * Constant that is true if the browser supports native DOM Ranges. IE 9+.
       *
       * @property range
       * @type Boolean
       */
      range: window.getSelection && "Range" in window,

      /**
       * Returns the IE document mode for non IE browsers this will fake IE 10.
       *
       * @property documentMode
       * @type Number
       */
      documentMode: ie && !ie12 ? (document.documentMode || 7) : 10,

      /**
       * Constant that is true if the browser has a modern file api.
       *
       * @property fileApi
       * @type Boolean
       */
      fileApi: fileApi,

      /**
       * Constant that is true if the browser supports contentEditable=false regions.
       *
       * @property ceFalse
       * @type Boolean
       */
      ceFalse: (ie === false || ie > 8),

      /**
       * Constant if CSP mode is possible or not. Meaning we can't use script urls for the iframe.
       */
      canHaveCSP: (ie === false || ie > 11),

      desktop: !phone && !tablet,
      windowsPhone: windowsPhone
    };
  }
);
